OK, efficiency for anything is power in divided by power out. Watt is the unit for power and for electricity, Watts = volts times amps. In the case of an appliance with a 15 amp max draw at 120 volts, the peak power required to operate it is going to be 15 x 120 or 1800 watts. Now that is PEAK draw, like when the A/C compressor first kicks on. Most of the time, it will draw less than 15 amps.
Back to efficiency....For that, we need a way to measure how much power output the device has. For that, we have another formula to find watts.... watts = force times distance divided by time. So if I'm running an electric winch to lift something, the power will be the weight of the load multiplied by how high it is lifted divided by how long it takes to lift it. No machine is 100% efficient as friction and heat will rob some of the power. Hope this helps
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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